An instance of this object represents a device that is tracked such as a controller or anchor point. HMDs aren’t represented here as they are fully handled internally.

As controllers are turned on and the AR/VR interface detects them instances of this object are automatically added to this list of active tracking objects accessible through the ARVRServer

The ARVRController and ARVRAnchor both consume objects of this type and should be the objects you use in game. The positional trackers are just the under the hood objects that make this all work and are mostly exposed so GDNative based interfaces can interact with them.